I think you did an excellent job of synchro-sunlight work, especially for a beginner; I have seen much poorer work being sold by the new generation of "professional 'fata'gra'phers" shooting engagement,wedding,and family portraiture gigs. Seriously, very good synchro-sun light work!
The way you positioned her in relation to the sun was very well conceived. Give yourself a little back pat!!! Your flash exposures in relation to the daylight ambient were really good. Better than many "pros" turn out.
I'll comment on the first two photos and what I see as the most important thing that can be learned, and that is that shooting from close range with short focal length settings leads to exaggerated limbs and noses; on the first two shots, her nose looks a bit too large,and her arms and hands also look physically large compared to her feet. When the lens is short in length, and the camera-to-subject distance is close, you get a wide background angle of view, deep depth of field, AND foreshortening--and the foreshortening is making her features look exaggerated. In the first shot, look at her head, and then her feet; that size disparity is not really attractive in a glamour shot like this. Had you shot this from 20 feet away with the 55-200 set to 175mm-180mm, the shot would have been outstanding. The background would have been narrower in angle of view BUT you would have also had roughly the same DOF on her head-to-foot zone, due to the longer camera to subject distance, but the background would have been a bit more subdued.
Still--a terrific job with the fill-in flash in what is called synchro-sunlight work.